Demo app and the component

LDAP4D_Authorize

Free, no charge. Try pointing it at a Windows 2000, 2003 Server, Mac OS
X Server, etc. with the appropriate username and password, and DN. The
downside is that this component doesn't support SSL connections.6.8, 2003 for 2004 just install and
let 4D convert it- readme - source

Windows

just the component

2003 LDAP4D 2.0 (v2.0 - serial
numbers from earlier versions won't work with this - new ones are
required)